Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / s390 / block / scm_drv.c

diff --git a/kernel/drivers/s390/block/scm_drv.c b/kernel/drivers/s390/block/scm_drv.c
new file mode 100644 (file)
index 0000000..c98cf52
--- /dev/null
+++ b/kernel/drivers/s390/block/scm_drv.c
@@ -0,0 +1,92 @@
+/*
+ * Device driver for s390 storage class memory.
+ *
+ * Copyright IBM Corp. 2012
+ * Author(s): Sebastian Ott <sebott@linux.vnet.ibm.com>
+ */
+
+#define KMSG_COMPONENT "scm_block"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <asm/eadm.h>
+#include "scm_blk.h"
+
+static void scm_notify(struct scm_device *scmdev, enum scm_event event)
+{
+       struct scm_blk_dev *bdev = dev_get_drvdata(&scmdev->dev);
+
+       switch (event) {
+       case SCM_CHANGE:
+               pr_info("%lx: The capabilities of the SCM increment changed\n",
+                       (unsigned long) scmdev->address);
+               SCM_LOG(2, "State changed");
+               SCM_LOG_STATE(2, scmdev);
+               break;
+       case SCM_AVAIL:
+               SCM_LOG(2, "Increment available");
+               SCM_LOG_STATE(2, scmdev);
+               scm_blk_set_available(bdev);
+               break;
+       }
+}
+
+static int scm_probe(struct scm_device *scmdev)
+{
+       struct scm_blk_dev *bdev;
+       int ret;
+
+       SCM_LOG(2, "probe");
+       SCM_LOG_STATE(2, scmdev);
+
+       if (scmdev->attrs.oper_state != OP_STATE_GOOD)
+               return -EINVAL;
+
+       bdev = kzalloc(sizeof(*bdev), GFP_KERNEL);
+       if (!bdev)
+               return -ENOMEM;
+
+       dev_set_drvdata(&scmdev->dev, bdev);
+       ret = scm_blk_dev_setup(bdev, scmdev);
+       if (ret) {
+               dev_set_drvdata(&scmdev->dev, NULL);
+               kfree(bdev);
+               goto out;
+       }
+
+out:
+       return ret;
+}
+
+static int scm_remove(struct scm_device *scmdev)
+{
+       struct scm_blk_dev *bdev = dev_get_drvdata(&scmdev->dev);
+
+       scm_blk_dev_cleanup(bdev);
+       dev_set_drvdata(&scmdev->dev, NULL);
+       kfree(bdev);
+
+       return 0;
+}
+
+static struct scm_driver scm_drv = {
+       .drv = {
+               .name = "scm_block",
+               .owner = THIS_MODULE,
+       },
+       .notify = scm_notify,
+       .probe = scm_probe,
+       .remove = scm_remove,
+       .handler = scm_blk_irq,
+};
+
+int __init scm_drv_init(void)
+{
+       return scm_driver_register(&scm_drv);
+}
+
+void scm_drv_cleanup(void)
+{
+       scm_driver_unregister(&scm_drv);
+}